Retirement and Other Employee Benefits (Narrative) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 26, 2014	Dec. 27, 2013	Dec. 28, 2012	Dec. 30, 2011
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Increase in amount recognized in accumulated other comprehensive income due to change in the method of calculating the discount rate and rate of increase in compensation levels		$ (3.3)	$ (4.8)
Expected contributions, 2013		0.8
Expected contributions, 2014		0.8
Expected contributions, 2015		0.8
Expected contributions, 2016		0.8
Expected contributions, 2017 and thereafter		0.8
Actual return on plan assets, percentage		6.00%	10.00%
Defined contribution plan expense		1.1	1.1	1.0
Financial Institutions [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Portfolio of stocks invested, industry concentration		23.00%
Oil and Gas Company [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Portfolio of stocks invested, industry concentration		16.00%
Basic Materials [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Portfolio of stocks invested, industry concentration		13.00%
Consumer Goods [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Portfolio of stocks invested, industry concentration		12.00%
Industrial [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Portfolio of stocks invested, industry concentration		11.00%
Other Industries [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Portfolio of stocks invested, industry concentration		25.00%
United Kingdom Companies [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Plan assets target allocation percentage, equity securities		42.00%
U.S. and European Companies Equities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Plan assets target allocation percentage, equity securities		27.00%
Other International Companies [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Plan assets target allocation percentage, equity securities		10.00%
Fixed Income Securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Plan assets target allocation percentage, equity securities		20.00%
Fixed Income Securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Investment maturity period		15 years
UNITED STATES Pension Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Increase in amount recognized in accumulated other comprehensive income due to change in the method of calculating the discount rate and rate of increase in compensation levels		(2.1)	1.0
2012 Amortization of net losses (gains)	(0.3)
Net periodic pension costs		0.1	0.1	0.1
Expected contributions, 2012	0.7
Expected future benefit payments, thereafter		6.1
Pension Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Increase in amount recognized in accumulated other comprehensive income due to change in the method of calculating the discount rate and rate of increase in compensation levels		3.7	4.1
Expected contributions, 2012	2.2
UNITED KINGDOM [Member] | Pension Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Increase in amount recognized in accumulated other comprehensive income due to change in the method of calculating the discount rate and rate of increase in compensation levels		(4.4)	3.3
Net periodic pension costs		(0.1)	(0.1)	0.2
Impact in benefit obligation		6.3
Expected future benefit payments, thereafter		12.7
CENTRAL AMERICA [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Increase in amount recognized in accumulated other comprehensive income due to change in the method of calculating the discount rate and rate of increase in compensation levels		(0.9)	(0.6)	(0.9)
Accrued benefits		6.7	7.1
2012 Amortization of net losses (gains)	0
Expected contributions, 2012	0.8
Expected future benefit payments, thereafter		3.4
CENTRAL AMERICA [Member] | Pension Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic pension costs		$ 0.3	$ 0.3	$ 0.3
Maximum [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Plan assets target allocation percentage, equity securities (minimum)		50.00%
Plan assets target allocation percentage, equity securities (maximum)		70.00%
Minimum [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Plan assets target allocation percentage, equity securities (minimum)		30.00%
Plan assets target allocation percentage, equity securities (maximum)		50.00%